PART 12 — RESOURCE CONSERVATION AND ENVIRONMENTAL INTEGRITYUpdated for the 2024 Ontario Building Code
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12.3.1.4.Hot Water Piping Insulation
(1) Hot water pipes that are vertically connected to a hot water storage tank shall have heat traps on both inlet and outlet
piping as close as practical to the tank, except where the tank
(a) has an integral heat trap, or
(b) serves a recirculating system.
(2) The first 2.5 m of hot water outlet piping of a hot water storage tank serving a non-recirculating system shall be
insulated to provide a thermal resistance of not less than RSI 0.62.
(3) The inlet pipe of a hot water storage tank between the heat trap and the tank serving a non-recirculating system shall
be insulated to provide a thermal resistance of not less than RSI 0.62.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.